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sched: fix rt ptracer monopolizing CPU

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yield() in wait_task_inactive(), can cause a high priority thread to be
scheduled back in, and there by loop forever while it is waiting for some
lower priority thread which is unfortunately still on the runqueue.

Use schedule_timeout_uninterruptible(1) instead.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Credit: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Gautham R Shenoy 2007-10-15 17:00:14 +02:00 committed by Ingo Molnar
parent 5cb350baf5
commit 638e13ac37
1 changed files with 1 additions and 1 deletions
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2
kernel/sched.c
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@ -1133,7 +1133,7 @@ void wait_task_inactive(struct task_struct *p)
* yield - it could be a while.
*/
if (unlikely(on_rq)) {
yield();
schedule_timeout_uninterruptible(1);
goto repeat;
}